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<div class="subTitle">org.apache.commons.math3.transform</div>
<h2 title="Class TransformUtils" class="title">Class TransformUtils</h2>
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<pre>public class <span class="strong">TransformUtils</span>
extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Useful functions for the implementation of various transforms.</div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>3.0</dd>
<dt><span class="strong">Version:</span></dt>
  <dd>$Id: TransformUtils.java 1385310 2012-09-16 16:32:10Z tn $</dd></dl>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/transform/TransformUtils.html#createComplexArray(double[][])">createComplexArray</a></strong>(double[][]&nbsp;dataRI)</code>
<div class="block">Builds a new array of <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> from the specified two dimensional
 array of real and imaginary parts.</div>
</td>
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<td class="colFirst"><code>static double[][]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/transform/TransformUtils.html#createRealImaginaryArray(org.apache.commons.math3.complex.Complex[])">createRealImaginaryArray</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;dataC)</code>
<div class="block">Builds a new two dimensional array of <code>double</code> filled with the real
 and imaginary parts of the specified <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> numbers.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/transform/TransformUtils.html#exactLog2(int)">exactLog2</a></strong>(int&nbsp;n)</code>
<div class="block">Returns the base-2 logarithm of the specified <code>int</code>.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/transform/TransformUtils.html#scaleArray(org.apache.commons.math3.complex.Complex[], double)">scaleArray</a></strong>(<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;f,
          double&nbsp;d)</code>
<div class="block">Multiply every component in the given complex array by the
 given real number.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/transform/TransformUtils.html#scaleArray(double[], double)">scaleArray</a></strong>(double[]&nbsp;f,
          double&nbsp;d)</code>
<div class="block">Multiply every component in the given real array by the
 given real number.</div>
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<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>scaleArray</h4>
<pre>public static&nbsp;double[]&nbsp;scaleArray(double[]&nbsp;f,
                  double&nbsp;d)</pre>
<div class="block">Multiply every component in the given real array by the
 given real number. The change is made in place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>f</code> - the real array to be scaled</dd><dd><code>d</code> - the real scaling coefficient</dd>
<dt><span class="strong">Returns:</span></dt><dd>a reference to the scaled array</dd></dl>
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<h4>scaleArray</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;scaleArray(<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;f,
                   double&nbsp;d)</pre>
<div class="block">Multiply every component in the given complex array by the
 given real number. The change is made in place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>f</code> - the complex array to be scaled</dd><dd><code>d</code> - the real scaling coefficient</dd>
<dt><span class="strong">Returns:</span></dt><dd>a reference to the scaled array</dd></dl>
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<h4>createRealImaginaryArray</h4>
<pre>public static&nbsp;double[][]&nbsp;createRealImaginaryArray(<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;dataC)</pre>
<div class="block">Builds a new two dimensional array of <code>double</code> filled with the real
 and imaginary parts of the specified <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> numbers. In the
 returned array <code>dataRI</code>, the data is laid out as follows
 <ul>
 <li><code>dataRI[0][i] = dataC[i].getReal()</code>,</li>
 <li><code>dataRI[1][i] = dataC[i].getImaginary()</code>.</li>
 </ul></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dataC</code> - the array of <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> data to be transformed</dd>
<dt><span class="strong">Returns:</span></dt><dd>a two dimensional array filled with the real and imaginary parts
   of the specified complex input</dd></dl>
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<h4>createComplexArray</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex">Complex</a>[]&nbsp;createComplexArray(double[][]&nbsp;dataRI)
                                    throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Builds a new array of <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> from the specified two dimensional
 array of real and imaginary parts. In the returned array <code>dataC</code>,
 the data is laid out as follows
 <ul>
 <li><code>dataC[i].getReal() = dataRI[0][i]</code>,</li>
 <li><code>dataC[i].getImaginary() = dataRI[1][i]</code>.</li>
 </ul></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dataRI</code> - the array of real and imaginary parts to be transformed</dd>
<dt><span class="strong">Returns:</span></dt><dd>an array of <a href="../../../../../org/apache/commons/math3/complex/Complex.html" title="class in org.apache.commons.math3.complex"><code>Complex</code></a> with specified real and imaginary parts.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the number of rows of the specified
   array is not two, or the array is not rectangular</dd></dl>
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<h4>exactLog2</h4>
<pre>public static&nbsp;int&nbsp;exactLog2(int&nbsp;n)
                     throws <a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block">Returns the base-2 logarithm of the specified <code>int</code>. Throws an
 exception if <code>n</code> is not a power of two.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the <code>int</code> whose base-2 logarithm is to be evaluated</dd>
<dt><span class="strong">Returns:</span></dt><dd>the base-2 logarithm of <code>n</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if <code>n</code> is not a power of two</dd></dl>
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